Here we show how to use external SOAP web services from within Microsoft Visual Studio versions 2005, 2008 and 2010.
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Visual Studio for Mac enables the creation of.NET Core solutions, providing the back-end services to your client solutions. Code, debug, and test these cloud services simultaneously with your client solutions for increased productivity. This video explains Step by Step how to create a SOAP web service using Visual Studio. The topics discussed in this video includes: 1. What About Web Services 2. Creating a Web Service Solution 3.
The scope of this article extends only to XML SOAP web services which may have been created in Visual Studio (and are usually identified by the asmx extension at the end of the URL).
In order to demonstrate the use of external web services, we will use T2A’s SOAP service, which was created using Visual Studio 2005.
All code examples here are in C#. The crooked man download mac.
If you’ve never made use of an external web service from Visual Studio, you’re about to discover just how easy it is. In comparison, parsing XML yourself can be quite time consuming, even using a powerful XML reader or parser. A SOAP web service allows Visual Studio to discover how its methods operate (their inputs and return formats) and using this information, allows your IDE to create code within your project, to allow your code to seamlessly use the external service, just as if it was a class in your own code.
In order to simply demonstrate the use of T2A’s SOAP service, we created a C# console application. The IDE created an empty project. Rd client download for mac. Free trial parallels for mac your pc ran into some problems.
We then “told” our project about the web service. We right clicked on the project in the solution explorer, and clicked on Add Web Reference. This can be viewed below, for our project ws_test_2005:-
Visual studio for mac download. A new window opened, in which we specified the location of the web service, in this case, https://t2a.co/soap. We clicked the go button:-
The IDE was able to identify the web service. We named the web service t2a. We then clicked on add reference as seen below.
The IDE then created the necessary code to allow our simple project to use the external web service. You can see the information about the added web reference in the right hand pane below:-
We then created a simple console application which uses the T2A soap service, specifically the geo_code method, which as its name suggests, returns geographical co-ordinates for a given postcode, street or place.
The example code shown below uses T2A’s free test mode, during which it returns dummy data at no charge, for the benefit of developers in their initial integration stages.
When the console application is executed in the debugger, we can see the class instance that the IDE has created; in this case an array of geo_data instances, this being a member of the result class geo_code_res. Note in the bottom pane the contents of the class instances, in this case, the dummy data returned by T2A in free test mode:-
Normally you would use the API key associated with your T2A account; for this example we are using T2A’s free test mode; this is activated by an API key “test”:-
Remember that we named the external web service t2a? The code created by the IDE is in a namespace t2a. The namespace includes the main class that contains the T2A methods; this is named T2A, or more correctly, t2a.T2A. Free paint tool sai mac download.
We now create an instance of that class.
The geo_code method returns an instance of the class t2a.geo_code_res. We now invoke the method; the third parameter is the place, street or postcode for which we want the geo co-ordinates. https://gymtree690.weebly.com/blog/fs-studio-for-mac.
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If the method has succeeded, the status is ok. If not, we normally would then read the error code.
We then display the contents of the t2a.geo_data instances held in the array t2a.geo_code_res.geo_data_list.
We created a C# console application; it actually uses the same code as shown above. When adding the web reference, the first thing one notices is that whereas formerly beneath Add Reference there was an item Add Web Reference, this seems to be missing from Visual Studio 2008. In its place is Add Service Reference.
We clicked that instead (see below).
A new window opened, named Add Service Reference. In order to add a “legacy” web reference, we clicked the advanced button at the bottom. Creating a website in visual studio for the mac.
Yet another new window opened, named Service Reference Settings. We hit the Add Web Reference button at the bottom.
From that point, adding the web reference is the same as above, for Visual Studio 2005. We created the reference by informing the dialog box that we wished to use https://t2a.co/soap as we had with Visual Studio 2005.
The procedure for adding the web reference is the virtually the same for the 2010 version as for 2008; the image below shows the default Solution Explorer pane for our console application.
Visual Studio .NET includes a wizard that makes creating a Web services client easy, using an “add a reference” metaphor that will be familiar to many programmers. To see how this is done, we'll build a Web services client in C# for XMethods’ sample temperature service. This service provides the temperature in degrees Fahrenheit for a given U.S. zip code.Using the Add Web Reference wizard
The Add Web Reference wizard can be invoked in several ways: You can use the Solution Explorer’s right-click context menu or use the Project>Add Web Reference menu option. Invoking the wizard presents a Web browser window, shown in Figure A.
Figure A |
The Add Web Reference browser showing the temperature service |
In theory, you can use the built-in UDDI search feature to locate the Web service you want to consume, but in practice, I’ve found it difficult to locate many working services in this fashion. So I use external sources like XMethods. In this case, since you know the URL for the service definition you’ll be consuming (http://www.xmethods.net/sd/2001/TemperatureService.wsdl), you can simply type or paste it into the browser.
Once the browser downloads the definition files for the temperature service, click the Add Reference button. Visual Studio .NET will create a local proxy class based on the service’s WSDL definition to which your client application can bind. This class will be added to your project in a child namespace of your project’s namespace—in this case, you should find that a net.xmethods.www.TemperatureService class has been added to your project.
You can look over the generated code by checking out Listing A. The class view of my sample project in Figure B shows the newly created namespace hierarchy for the proxy class.
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Figure B |
The class view of the TemperatureService proxy class |
By default, this generated code is saved under a Web References subfolder in your project’s folder and is hidden by the Solution Explorer. You can open it manually or click the Show All Files toolbar button if you want to view or tweak it.
Understanding the generated code
The generated class inherits from System.Web.Services.Protocols.SoapHttpClientProtocol, which provides a base set of methods for consuming a Web service. The association with the actual Web service is defined by a set of attributes that decorate the main class and the proxy class’s constructor, which sets the URL for the service into the base class’s Url property. I’ve listed these attributes and their meanings in Table A.
Table A
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The System.Web.Services.WebServiceBindingAttribute attribute associates the proxy class with a service by name, in this case, SQL Terms and DefinitionsSoap. This name is defined as a service port in the Web service’s WSDL definition. Visual Studio creates three methods for each of the operations defined for a given service port: two for asynchronous invocation and one for synchronous use. You can, despite the commented warnings inserted by the wizard, clean out the method versions you don’t want to use to keep things tidy.
Ports and operations? What are those?
Visual Studio uses a Web service’s WSDL definition document to build your local proxy class. Web services can offer various binding points, defined as ports in the WSDL document, to support different protocols or functionality—think of these as you would interfaces. The methods available for each Web service interface are defined as operations in WSDL. For more information on WSDL itself, see “Defining Web services in WSDL: A primer.”
You’ll notice that the synchronous proxy class method, GetTemp, also has an attribute associated with it. The System.Web.Services.Protocols.SoapDocumentMethodAttribute allows you to specify the header for the SOAP message sent by the decorated proxy message. By changing the header, you can change the way the remote service handles your message.
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Using the proxy classAt this point, you have a local class that your application can use to access the methods provided by the Web service. Now it’s a simple matter of object creation and method invocation to use any of the methods provided by the service. In Listing B, I’ve placed the code for a simple console application that requests the temperature for locations typed in by the user. You can see there’s not much to it: First, the proxy class is instantiated and the user is prompted for a zip code. Then, the GetTemp method is invoked, which takes care of calling the actual remote method behind the scenes. That’s really all there is to it, at least in the case of a simple service.
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